Charles roberts



- @uith tatrs gstrnt @fitte G RERLESV ROBERTS, 0E LAKE VILLAGE,A NEWHAMPSHIRE. Letters Patent No. 73,465, datedJamtary 21', 1868.

IMPROVEMENT 1N EEADBLocKs EoR SAW-MILLS.

TO ALL'WIIOM IT AMY CONCERN Be it know that I, CHARLES ROBERTS, of LakeVillage,`.iu the county of Belknap, and-State of New `Hampshire, haveinvented -certain Improvementsin Saw-Mills g. and I do hereby declarethat the following is a specification- Figure 1 being a. top vienr ofthe carraige of a saw-mill provided vwith my improvements. Figure 2, aside elevation thereof.

Figure 3, a transverse vertical section of thc same in a plane indicatedby the line rca, iig. 1. Like letters designate corresponding parts inall of the figures. The purpose of this invention is to connect all thehead-rests of the carriage in such a manner that they full and exactdescription thereof, reference being had to theaccompanying drawings,making part of this may be operated togetherfby .a single lever, or itsequivalent, or any number less than be moved together,I

or each operated separately, as may be desired. l,

,In the drawings, let represent a saw-mill carriage, I3 C D threehead-blocks thereon, E G H, 'respectively, the head-rests of the saidhead-blocks. Each rest has, on -the sides of its horizontal partor body,ridges or vanes a a, fig. 2, which fit and slide in side grooves of thehead-block, in which itlmoves, and on the lower side thereof is a set ofratchet-teeth,'into which gears a pinion, b, as indicated by dottedlinesinthe same figure. Each pinion bhas a different shaft, to which itis so`secured as to slide freely lengthwise, but not to turnthereon. Aconvenient` meansofaccomplishing this is to form a lcixgitudinalgroove,lf,vin each shaft,

into which fits aprojection from the eye of 'the pinion. rIhus,by'turning either of the shafts, its pinion will turn with it, and' movethe correspondingV head-rest,'while the headblopk, rest, and pinion canbe shifted lengthwise on theshaft at pleasure. The object, now, here tobe accomplished is, to so arrange these shafts as to enable them to bemoved simultaneously or separately. To `effect this, I employ avibratory lever, M, near the front end of the carriage, or in aconvenient position thereon, pivoting it upon one of the shafts,'orconcentric with them, substantially as indicated-in g. 3. The severalshafts I K L (three or more) all terminate at one end thereof, nearoneor the other side'of this lever. To do this, two shafts, I L, may besimple solid j shafts, and extend to the furthest head-blocks, or to theends of thecarriage. The intermediate head-block K (or blocks, if ther-eare more than -three in all) is tubular, and surrounds the shaft L;andif there were more .than four blocks, the next pair would have toiboconnected with the lover by` tubular shafts outside of the first tubularshafts, and so'on, although three'or four blocks are practically alllthat are generally required. Then -ench shaft, solid or tubular, has.attached to its end, adjacent to the lever M, a ratchet-Wheel, P, theteeth of which are so shaped as to enable it to be moved eithorwayby apawl, or pawls, with equal facility and certainty. A pawl, N, foreachratchet-wheel' is pivoted to the lever. M in such a manner, and is soshaped, that either end or neither will take-into the notchesjor teethof its ratchet-wheel; and each pawl is connected, by means of an elastichandle or spring, h, with a' connecting-rod, y, which extends upward toan adjusting-lever, Q, or its equivalent, pivoted to the lever M nearits upper end orhandle, as shown most clearly in iig. 3. By adjustingthese levers, which romain or are retained in any position in which theyare placed, e'ach pawl below 'is made to take into its ratchet-wheel ateither end required, so as to turnits shaft, and consequently move thecorresponding head-rest either way required, or so that neither end ofthe pawl will move its ratchet-wheel, and consequently the correspondinghead-rest will remain stationary; hence, on vibrating the lever M,either or all of the head-rests will lbe moved in the direction requiredto adjust them to position. In connection with this-lever` M,I arrange acurved concentric scale, R, marked' with holes, pins, or notches, andnumbered, so that the extent to which the head-rests are moved by thomotions of the lever are measured and indicated. Other scales are, ormay be, marked directly' on the head-blocks to direct theadjustment'ormovement of the head-rests. l I

What I claim as my invention, and desire to secure by Letters Patent,is-

The combination of the tubular shaft or shafts K with Athe other shaftor shafts I L, and the lever M, with its pawls, or their equivalent,constructed and operating substantially as and for the purpose hereinspecied.

The above specification of my improvements in saw-mills signed by me,this 31st day of January, 1867.

' 'CHARLES ROBERTS.

Witnesses:

R. C. SANBORN, F. H. DAVIS.

